Annual report pursuant to Section 13 and 15(d)

Stock Option and Purchase Plans - Summary of Weighted Average Fair Value of Options Granted (Detail)

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Stock Option and Purchase Plans - Summary of Weighted Average Fair Value of Options Granted (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Weighted Average Fair Value of the Options Granted $ 23.22 $ 9.93 $ 12.65